Figure 2From: A case of recurrent respiratory papillomatosis with malignant transformation, HPV11 DNAemia, high L1 antibody titre and a fatal papillary endocardial lesion Immunohistochemical staining for the expression of cytokeratin 5/6, a typical marker of squamous epithelium, on a section of a focal squamous papillary metaplasia of the left atrium. Back to article page